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Illumination apparatus

a technology of illumination apparatus and illumination lamp, which is applied in the direction of electrical apparatus, instruments, basic electric elements, etc., can solve the problems of undesirable moiré and mura (non-uniformity) artefacts, non-uniform spatial distribution of output luminance of catadioptric optical elements, etc., and achieves the reduction of cost and complexity of manufacture, convenient formation, and increased uniform output.

Active Publication Date: 2020-04-23
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AI Technical Summary

Benefits of technology

The patent text describes an illumination apparatus that includes a plurality of micro-LEDs and a plurality of catadioptric optical elements arranged in a specific way to provide a more uniform output of light. The micro-LEDs are aligned with the catadioptric optical elements, and some of the light output from the micro-LEDs is reflected by one or more reflective members back into the catadioptric optical element to create recycled light. The recycled light is then further reflected by the catadioptric optical element to achieve a combined light output distribution with improved spatial uniformity compared to the original light output distribution. The technical effect of this invention is to provide a more efficient and high-resolution directional display with improved spatial uniformity.

Problems solved by technology

Such catadioptric optical elements provide non-uniform spatial distributions of output luminance for some viewing angles.
In backlight arrangements, such non-uniform spatial distributions may provide Moiré and mura (non uniformity) artefacts that are undesirable.

Method used

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Embodiment Construction

[0168]It would be desirable to provide a directional backlight for transmissive spatial light modulators such as liquid crystal displays with high spatial uniformity for directional viewing.

[0169]The operation of directional displays comprising plurality of micro-LEDs 3 and corresponding plurality of catadioptric optical elements 38 will first be described.

[0170]FIG. 1A is a schematic diagram illustrating a top view of a directional display comprising a spatial light modulator 112 and a directional backlight 110 comprising a plurality of micro-LEDs 3 that are each aligned with regions 204 of light deflecting surfaces 200; and a plurality of one dimensional catadioptric optical elements 38 that are linearly extended. FIG. 1B is a schematic diagram illustrating a perspective side view of the directional display of FIG. 1A. The catadioptric optical elements 38 are extended in the y direction, that may be the vertical direction for a display user.

[0171]Thus an illumination apparatus may...

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Abstract

An illumination apparatus comprises an array of micro-LEDs, an aligned plurality of directional catadioptric optical elements, light redirecting micro-optics and a reflective polariser. The directional illumination apparatus is arranged to provide a uniform spatial distribution across its output area by recirculating reflected high luminous intensity regions into low luminous intensity regions of the catadioptric optical element. A thin and efficient illumination apparatus with high spatial uniformity may be provided for illumination in environmental lighting, display backlighting or direct display.

Description

TECHNICAL FIELD[0001]The present disclosure relates to an apparatus comprising a plurality of addressable light-emitting elements aligned to a plurality of optical elements. Such an apparatus may be used for environmental lighting, for indoor or outdoor electronic display screens, or for a backlight to an LCD display.BACKGROUND[0002]Displays with wide directional light output distributions are typically used to achieve comfortable display viewing from many different viewing angles. Such displays are desirable for multiple users to share image content, and for displays where the viewing position is not substantially fixed in relation to the display centreline.[0003]By way of comparison displays with narrow directional light output distributions are typically used to provide image data for the eyes of users over reduced viewing angles. Such displays are typically used to achieve privacy display (where images that may be seen by snoopers are suppressed), night time display (where ambie...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B19/00G02F1/1335G09G3/34H01L33/60H01L25/075
CPCG09G3/3406G02F2001/133607H01L33/60G02B19/0066G02F1/133605H01L25/0753G02F1/133603G02F1/133611G02B19/0028G02F1/133606H01L33/58G02B19/0061G02F1/133607
Inventor WOODGATE, GRAHAM J.HARROLD, JONATHAN
Owner OPTOVATE
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